20 15 math examination paper at the end of the second day of junior high school - Training Enrollment Network

20 15 math examination paper at the end of the second day of junior high school

( 1) √20 15-√20 14 ; √n-√(n- 1)

(2)

The original formula =1/2 (√ 3-1+√ 5-√ 3+√ 7-√ 5+√ 2013) × (√ 20/kloc-.

= 1/2 ×(√20 15- 1)×(√20 15+ 1)

= 1/2 ×(20 15- 1)

= 1/2 ×20 14

= 1007

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